Double door unit for a firebox



FIG. 1 shows a front view of a double door unit for a firebox with both doors closed;

FIG. 2 shows a side view of the double door unit for a firebox, the opposite side being substantially identical except for the chain lock and two closure members;

FIG. 3 shows a front view of a double door unit for a firebox with both doors open; and,

FIG. 4 shows a front view of a double door unit for a firebox showing a second embodiment of my new design, the sole difference from the first embodiment being the window in the upper door.

The broken line showing of a firebox in FIGS. 1-4, is for illustrative purposes only and forms no part of the claimed design. 

The ornamental design for a double door unit for a firebox, as shown and described. 